Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D239/00—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
  • C07D239/02—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings
  • C07D239/24—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members
  • C07D239/28—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, directly attached to ring carbon atoms
  • C07D239/46—Two or more oxygen, sulphur or nitrogen atoms
  • C07D239/48—Two nitrogen atoms
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P35/00—Antineoplastic agents
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
  • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
  • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
  • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
  • C04B35/632—Organic additives
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D231/00—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings
  • C07D231/02—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings
  • C07D231/10—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
  • C07D231/12—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to ring carbon atoms
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D233/00—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings
  • C07D233/54—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members
  • C07D233/56—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members with only hydrogen atoms or radicals containing only hydrogen and carbon atoms, attached to ring carbon atoms
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D249/00—Heterocyclic compounds containing five-membered rings having three nitrogen atoms as the only ring hetero atoms
  • C07D249/02—Heterocyclic compounds containing five-membered rings having three nitrogen atoms as the only ring hetero atoms not condensed with other rings
  • C07D249/08—1,2,4-Triazoles; Hydrogenated 1,2,4-triazoles
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D401/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom
  • C07D401/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings
  • C07D401/12—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings linked by a chain containing hetero atoms as chain links
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D403/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00
  • C07D403/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings
  • C07D403/12—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings linked by a chain containing hetero atoms as chain links

Definitions

• the invention relates to pyrimidine derivatives, or pharmaceutically acceptable salts or in vivo hydrolysable esters thereof, which possess cell-cycle inhibitory activity and are accordingly useful for their anti-cancer (such as anti-cell-proliferative, anti-cell migration and/or apoptotic) activity and are therefore useful in methods of treatment of a warm-blooded animal, such as man.
• the invention also relates to processes for the manufacture of said pyrimidine derivatives, to pharmaceutical compositions containing them and to their use in the manufacture of medicaments or use in the production of an anti-cancer (anti-cell-proliferation/migration and/or apoptotic) effect in a warm-blooded animal such as man.
• Cyclins A family of intracellular proteins called cyclins play a central role in the cell cycle. The synthesis and degradation of cyclins is tightly controlled such that their level of expression fluctuates during the cell cycle. Cyclins bind to cyclin-dependent serine/threonine kinases (CDKs) and this association is essential for CDK (such as CDK1, CDK2, CDK4 and/or CDK6) activity within the cell. Although the precise details of how each of these factors combine to regulate CDK activity is poorly understood, the balance between the two dictates whether or not the cell will progress through the cell cycle.
• CDKs cyclin-dependent serine/threonine kinases
• CDKs appear to be downstream of a number of oncogene signalling pathways.
• Disregulation of CDK activity by upregulation of cyclins and/or deletion of endogenous inhibitors appears to be an important axis between mitogenic signalling pathways and proliferation of tumour cells.
• an inhibitor of cell cycle kinases particularly inhibitors of CDK2, CDK4 and/or CDK6 (which operate at the S-phase, G1-S and G1-S phase respectively) should be of value as a selective inhibitor of cell proliferation, such as growth of mammalian cancer cells.
• FAK focal adhesion kinase
• the present invention is based on the discovery that certain 2,4-pyrimidine compounds surprisingly inhibit the effects of cell cycle kinases showing selectivity for CDK2, CDK4 and CDK6, and also inhibit FAK and thus possess anti-cancer (anti-cell-migration/proliferation and/or apoptotic) properties.
• Such properties are expected to be of value in the treatment of disease states associated with aberrant cell cycles and cell proliferation such as cancers (solid tumours and leukemias), fibroproliferative and differentiative disorders, psoriasis, rheumatoid arthritis, Kaposi's sarcoma, haemangioma, acute and chronic nephropathies, atheroma, atherosclerosis, arterial restenosis, autoimmune diseases, acute and chronic inflammation, bone diseases and ocular diseases with retinal vessel proliferation.
• cancers solid tumours and leukemias
• fibroproliferative and differentiative disorders psoriasis, rheumatoid arthritis, Kaposi's sarcoma, haemangioma, acute and chronic nephropathies, atheroma, atherosclerosis, arterial restenosis, autoimmune diseases, acute and chronic inflammation, bone diseases and ocular diseases with retinal vessel proliferation.
• Pyrimidine derivatives having heterocyclic groups directly bound in the 4-position of the pyrimidine ring which are protein C kinase inhibitors and EGF-receptor specific tyrosine kinase inhibitors are described in WO-A-95/09852 and EP-A-564409 .
• aryl is a monocyclic ring containing 5 or 6 atoms or a bicyclic ring containing 9 or 10 atoms. More preferably “aryl” is phenyl, naphthyl, tetralinyl or indanyl. Particularly “aryl” is phenyl, naphthyl or indanyl. More particularly “aryl” is phenyl.
• a “carbon linked heteroaryl” is a fully unsaturated, 5- or 6- membered monocyclic ring or 9- or 10- membered bicyclic ring of which at least one atom is chosen from nitrogen, sulphur or oxygen. This ring is linked via a carbon atom to the - NH- (for Q 1 ) or G (for Q 2 ).
• carbon linked heteroaryl is furanyl, thienyl, pyrrolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, imidazolyl, pyrazolyl, furazanyl, triazolyl, thiadiazolyl, pyridyl, pyrimidyl, pyrazinyl, pyridazinyl, triazinyl, indolyl, quinolyl or benzimidazolyl. More preferably "carbon linked heteroaryl” is pyridyl, thiazolyl or pyrazolyl. Particularly “carbon linked heteroaryl” is pyridyl.
• a “heterocyclic group” is a saturated, partially saturated or unsaturated, mono or bicyclic ring containing 4-12 atoms of which at least one atom is chosen from nitrogen, sulphur or oxygen, which may, unless otherwise specified, be carbon or nitrogen linked, wherein a -CH 2 - group can optionally be replaced by a -C(O)-, and a ring sulphur atom may be optionally oxidised to form S-oxide(s).
• a "heterocyclic group” is pyrrolidinyl, morpholino, piperidyl, quinuclidinyl, pyridyl, pyranyl, pyrrolyl, isothiazolyl, indolyl, quinolyl, thienyl, furyl, 1,3-benzodioxolyl, thiadiazolyl, piperazinyl, thiazolidinyl, pyrrolidinyl, succinimidyl, thiomorpholino, pyrazolyl, pyrrolinyl, homopiperazinyl, tetrahydropyranyl, imidazolyl, pyrimidyl, pyrazinyl, pyridazinyl, isoxazolyl, phthalimidyl, 4-pyridone, 1-isoquinolone, 2-pyrrolidone, 4-thiazolidone, imidazo[1,2-a]pyridine or 3-aza-8-o
• a heterocyclic group is pyrrolidinyl, morpholino, piperidyl, quinuclidinyl, piperazinyl, succinimidyl, imidazolyl or phthalimidyl.
• alkyl includes both straight and branched chain alkyl groups but references to individual alkyl groups such as “propyl” are specific for the straight chain version only. An analogous convention applies to other generic terms. "Halo” is fluoro, chloro, bromo and iodo.
• Examples of C 2-4 alkenyl are vinyl and allyl; examples of C 2-6 alkenyl are C 3-5 alkenyl, vinyl and allyl; an example of C 3-6 alkenyl is allyl; an examples of C 3-6 alkynyl are C 3-5 alkynyl and propyn-2-yl; examples of C 2-4 alkynyl are ethynyl and propyn-2-yl; examples of C 2-6 alkynyl are ethynyl and propyn-2-yl; examples of C 1-4 alkanoyl are acetyl and propionyl; examples of C 1-4 alkoxycarbonyl are C 1-3 alkoxycarbonyl, C 1-2 alkoxycarbonyl, methoxycarbonyl, ethoxycarbonyl, propoxycarbonyl and tert -butoxycarbonyl; examples of C 1-4 alkylene are methylene, ethylene and propylene; examples of C 1-4 alkyl are C
• a suitable pharmaceutically acceptable salt of a pyrimidine derivative of the invention is, for example, an acid-addition salt of a pyrimidine derivative of the invention which is sufficiently basic, for example, an acid-addition salt with, for example, an inorganic or organic acid, for example hydrochloric, hydrobromic, sulphuric, phosphoric, trifluoroacetic, citric or maleic acid.
• a suitable pharmaceutically acceptable salt of a pyrimidine derivative of the invention which is sufficiently acidic is an alkali metal salt, for example a sodium or potassium salt, an alkaline earth metal salt, for example a calcium or magnesium salt, an ammonium salt or a salt with an organic base which affords a physiologically acceptable cation, for example a salt with methylamine, dimethylamine, trimethylamine, piperidine, morpholine or tris-(2-hydroxyethyl)amine.
• the compounds of the formula (I) may be administered in the form of a pro-drug which is broken down in the human or animal body to give a compound of the formula (I).
• pro-drugs include in vivo hydrolysable esters of a compound of the formula (I).
• An in vivo hydrolysable ester of a compound of the formula (I) containing carboxy or hydroxy group is, for example, a pharmaceutically acceptable ester which is hydrolysed in the human or animal body to produce the parent acid or alcohol.
• Suitable pharmaceutically acceptable esters for carboxy include C 1-6 alkoxymethyl esters for example methoxymethyl, C 1-6 alkanoyloxymethyl esters for example pivaloyloxymethyl, phthalidyl esters, C 3-8 cycloalkoxycarbonyloxyC 1-6 alkyl esters for example 1-cyclohexylcarbonyloxyethyl; 1,3-dioxolen-2-onylmethyl esters for example 5-methyl-1,3-dioxolen-2-onylmethyl; and C 1-6 alkoxycarbonyloxyethyl esters for example 1-methoxycarbonyloxyethyl and may be formed at any carboxy group in the compounds of this invention.
• An in vivo hydrolysable ester of a compound of the formula (I) containing a hydroxy group includes inorganic esters such as phosphate esters and ⁇ -acyloxyalkyl ethers and related compounds which as a result of the in vivo hydrolysis of the ester breakdown to give the parent hydroxy group.
• inorganic esters such as phosphate esters and ⁇ -acyloxyalkyl ethers and related compounds which as a result of the in vivo hydrolysis of the ester breakdown to give the parent hydroxy group.
• ⁇ -acyloxyalkyl ethers include acetoxymethoxy and 2,2-dimethylpropionyloxy-methoxy.
• a selection of in vivo hydrolysable ester forming groups for hydroxy include alkanoyl, benzoyl, phenylacetyl and substituted benzoyl and phenylacetyl, alkoxycarbonyl (to give alkyl carbonate esters), dialkylcarbamoyl and N -(dialkylaminoethyl)- N -alkylcarbamoyl (to give carbamates), dialkylaminoacetyl and carboxyacetyl.
• substituents on benzoyl include morpholino and piperazino linked from a ring nitrogen atom via a methylene group to the 3- or 4- position of the benzoyl ring.
• Some compounds of the formula (I) may have chiral centres and/or geometric isomeric centres (E- and Z- isomers), and it is to be understood that the invention encompasses all such optical, diastereo-isomers and geometric isomers that possess CDK and/or FAK inhibitory activity.
• the invention relates to any and all tautomeric forms of the compounds of the formula (I) that possess CDK and/or FAK inhibitory activity.
• Particular preferred compounds of the invention comprise a pyrimidine derivative of the formula (I), or pharmaceutically acceptable salt or in vivo hydrolysable ester thereof, wherein R 1 , Q 1 , Q 2 , and G have any of the meanings defined hereinbefore, or any of the following values. Such values may be used where appropriate with any of the definitions, claims or embodiments defined hereinbefore or hereinafter.
• Q 1 and Q 2 are independently selected from phenyl and pyridyl.
• Q 1 is phenyl
• Q 2 is phenyl or pyridyl.
• Q 1 is phenyl and Q 2 is selected from phenyl and pyridyl.
• one of Q 1 and Q 2 or both of Q 1 and Q 2 is substituted on a ring carbon by one substituent selected from N,N -di-(C 1-2 alkyl)amino, heterocyclic group, heterocyclic group-O-, substituted C 1-2 alkyl, substituted C 1-2 alkoxy, substituted C 1-2 alkoxycarbonyl, substituted N -(C 1-2 alkyl)amino, substituted C 1-2 alkoxyC 1-2 alkyl and substituted C 2-4 alkynyl; wherein said substituents for C 1-2 alkyl, C 1-2 alkoxy, C 1-2 alkoxycarbonyl, N -(C 1-2 alkyl)amino, C 1-2 alkoxyC 1-2 alkyl and C 2-4 alkynyl are selected from hydroxy, carboxy, amino, heterocyclic group, heterocyclic group-C(O)-, N -C 1-4 alkylamino and N,N -di-(C)
• one of Q 1 and Q 2 or both of Q 1 and Q 2 is substituted on a ring carbon by one substituent selected from N,N -di-(C 1-2 alkyl)amino, piperazino (optionally substituted on the 4-nitrogen by methyl), piperidin-3-yloxy (optionally substituted on nitrogen by methyl), piperidin-4-yloxy (optionally substituted on nitrogen by methyl), substituted C 1-2 alkyl, substituted C 1-2 alkoxy, substituted C 1-2 alkoxycarbonyl, substituted N -(C 1-2 alkyl)amino, substituted C 1-2 alkoxyC 1-2 alkyl and substituted C 2-4 alkynyl; wherein said substituents for C 1-2 alkyl, C 1-2 alkoxy, C 1-2 alkoxycarbonyl, N -(C 1-2 alkyl)amino, C 1-2 alkoxyC 1-2 alkyl and C 2-4 alkynyl are selected from hydroxy,
• Q 1 and Q 2 or both of Q 1 and Q 2 is substituted on a ring carbon by one substituent selected from dimethylamino, 4-methylpiperazino, aminomethyl, 2-hydroxyethoxymethyl, succinimid-1-ylmethyl, 2-pyrrolidin-1-ylethyl, 2-aminoethyl, piperid-4-yloxy, 1-methylpiperid-4-yloxy, 1-methylpiperid-3-yloxy, carboxymethoxy, 1-methylpiperid-2-ylmethoxy, 1-methylpiperid-3-ylmethoxy, piperid-4-ylmethoxy, 4-isopropylpiperazinocarbonylmethoxy, 2-pthalimid-1-ylethoxy, 2-morpholinoethoxy, 2-dimethylaminoethoxy, 2-diethylaminoethoxy, 2-(4-methylpiperazino)ethoxy, 2-imidazol-1-ylethoxy, 2-pyrrolidin-1-ylethoxy, 2-amino
• Q 1 and Q 2 or both of Q 1 and Q 2 is substituted on a ring carbon by one substituent selected from 1-methylpiperid-4-yloxy, carboxymethoxy, 2-dimethylaminoethoxy, 2-methylaminoethynyl, 2-piperidinoethylamino or 2-isopropylaminoethylamino.
• Q 1 that is substituted on a ring carbon by one substituent selected from N -(C 1-2 alkyl)amino, N,N -di-(C 1-2 alkyl)amino, phenyl, heterocyclic group, phenoxy, heterocyclic group-O-, substituted C 1-2 alkyl, substituted C 1-2 alkoxy, substituted C 1-2 alkoxycarbonyl, substituted N -(C 1-2 alkyl)amino, substituted C 1-2 alkoxyC 1-2 alkyl, substituted C 2-4 alkenyl and substituted C 2-4 alkynyl; wherein said substituents for C 1-2 alkyl, C 1-2 alkoxy, C 1-2 alkoxycarbonyl, N -(C 1-2 alkyl)amino, C 1-2 alkoxyC 1-2 alkyl, C 2-4 alkenyl and C 2-4 alkynyl are selected from halo, hydroxy, mercapto, nitro
• Q 1 is substituted in the para- or meta- position relative to the -NH-.
• Q 1 is substituted in the para- position relative to the -NH-.
• G is -O-.
• G is -NR 2 -.
• G is -NR 2 -, preferably R 2 is hydrogen.
• R 2 is not hydrogen
• R 1 is hydrogen, chloro or bromo.
• Q 2 is unsubstituted or substituted by one group selected from fluoro, bromo, methyl, methoxy and cyano.
• Q 2 is unsubstituted or substituted by one methyl group.
• Q 2 is phenyl, 2-cyanophenyl, 3-methylphenyl, 4-fluorophenyl, 4-bromophenyl, 4-methoxyphenyl or 6-methylpyrid-2-yl.
• Q 2 is phenyl or 6-methylpyrid-2-yl.
• preferred compounds of the invention are those of Examples 2, 12, 21, 28, 30 or 38 or pharmaceutically acceptable salt or in vivo hydrolysable ester thereof.
• preferred compounds of the invention include any one of the Examples or pharmaceutically acceptable salt or in vivo hydrolysable ester thereof.
• Preferred aspects of the invention are those which relate to the compound or a pharmaceutically acceptable salt thereof.
• a pyrimidine derivative of the formula (I), or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof may be prepared by any process known to be applicable to the preparation of chemically-related compounds. Such processes, when used to prepare a pyrimidine derivative of the formula (I) , or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof, are provided as a further feature of the invention and are illustrated by the following representative examples in which, unless otherwise stated R 1 , Q 1 , Q 2 and G have any of the meanings defined hereinbefore for a pyrimidine derivative of the formula (I) and unless another substituent is drawn on ring Q 1 or Q 2 the ring may bear any of the substituents described hereinbefore (optionally protected as necessary).
• L is a displaceable group, suitable values for L are for example, a halo, sulphonyloxy or sulphur group, for example a chloro, bromo, methanesulphonyloxy, toluene-4-sulphonyloxy, mesyl, methylthio and methylsulphinyl.
• Pyrimidines of the formula (II) may be prepared according to the following scheme: wherein R a is an optionally substituted alkyl or aryl group and L is a displaceable group as defined above.
• R a is methyl, ethyl or p-tolyl.
• Pyrimidines of formula (IV) and anilines of formula (V) may be reacted together, i) in the presence of a suitable solvent for example a ketone such as acetone or an alcohol such as ethanol or butanol or an aromatic hydrocarbon such as toluene or N -methyl pyrrolidine, optionally in the presence of a suitable acid such as those defined above (or a suitable Lewis acid) and at a temperature in the range of 0°C to reflux, preferably reflux; or ii) under standard Buchwald conditions as described above.
• a suitable solvent for example a ketone such as acetone or an alcohol such as ethanol or butanol or an aromatic hydrocarbon such as toluene or N -methyl pyrrolidine
• a suitable acid such as those defined above (or a suitable Lewis acid) and at a temperature in the range of 0°C to reflux, preferably reflux; or ii) under standard Buchwald conditions as described above.
• Pyrimidines of formula (IV) are prepared according to the following scheme: wherein L is a displaceable group as defined above.
• anilines of formula (V) are commercially available or are prepared by processes known in the art.
• Pyrimidines of the formula (IVA) are commercially available or may be prepared by, for example, reacting a compound of formula (IVA) in which L is -OH (i.e. a uracil), with POCl 3 to give a compound of formula (IVA) in which L is -Cl.
• a preferred process of the invention is Process b).
• aromatic substitution reactions include the introduction of a nitro group using concentrated nitric acid, the introduction of an acyl group using, for example, an acyl halide and Lewis acid (such as aluminium trichloride) under Friedel Crafts conditions; the introduction of an alkyl group using an alkyl halide and Lewis acid (such as aluminium trichloride) under Friedel Crafts conditions; and the introduction of a halo group.
• modifications include the reduction of a nitro group to an amino group by for example, catalytic hydrogenation with a nickel catalyst or treatment with iron in the presence of hydrochloric acid with heating; oxidation of alkylthio to alkylsulphinyl or alkylsulphonyl.
• a suitable protecting group for an amino or alkylamino group is, for example, an acyl group, for example an alkanoyl group such as acetyl, an alkoxycarbonyl group, for example a methoxycarbonyl, ethoxycarbonyl or t -butoxycarbonyl group, an arylmethoxycarbonyl group, for example benzyloxycarbonyl, or an aroyl group, for example benzoyl.
• the deprotection conditions for the above protecting groups necessarily vary with the choice of protecting group.
• an acyl group such as an alkanoyl or alkoxycarbonyl group or an aroyl group may be removed for example, by hydrolysis with a suitable base such as an alkali metal hydroxide, for example lithium or sodium hydroxide.
• a suitable base such as an alkali metal hydroxide, for example lithium or sodium hydroxide.
• an acyl group such as a t-butoxycarbonyl group may be removed, for example, by treatment with a suitable acid as hydrochloric, sulphuric or phosphoric acid or trifluoroacetic acid and an arylmethoxycarbonyl group such as a benzyloxycarbonyl group may be removed, for example, by hydrogenation over a catalyst such as palladium-on-carbon, or by treatment with a Lewis acid for example boron tris(trifluoroacetate).
• a suitable alternative protecting group for a primary amino group is, for example, a phthaloyl group which may be removed by treatment with an alkylamine, for example dimethylaminopropylamine, or with hydrazine.
• a suitable protecting group for a hydroxy group is, for example, an acyl group, for example an alkanoyl group such as acetyl, an aroyl group, for example benzoyl, or an arylmethyl group, for example benzyl.
• the deprotection conditions for the above protecting groups will necessarily vary with the choice of protecting group.
• an acyl group such as an alkanoyl or an aroyl group may be removed, for example, by hydrolysis with a suitable base such as an alkali metal hydroxide, for example lithium or sodium hydroxide.
• a suitable base such as an alkali metal hydroxide, for example lithium or sodium hydroxide.
• an arylmethyl group such as a benzyl group may be removed, for example, by hydrogenation over a catalyst such as palladium-on-carbon.
• a suitable protecting group for a carboxy group is, for example, an esterifying group, for example a methyl or an ethyl group which may be removed, for example, by hydrolysis with a base such as sodium hydroxide, or for example a t-butyl group which may be removed, for example, by treatment with an acid, for example an organic acid such as trifluoroacetic acid, or for example a benzyl group which may be removed, for example, by hydrogenation over a catalyst such as palladium-on-carbon.
• a base such as sodium hydroxide
• a t-butyl group which may be removed, for example, by treatment with an acid, for example an organic acid such as trifluoroacetic acid, or for example a benzyl group which may be removed, for example, by hydrogenation over a catalyst such as palladium-on-carbon.
• the protecting groups may be removed at any convenient stage in the synthesis using conventional techniques well known in the chemical art.
• the pyrimidine derivative defined in the present invention possesses anti-cell-proliferation activity such as anti-cancer activity which is believed to arise from the CDK and/or FAK inhibitory activity of the compound.
• anti-cell-proliferation activity such as anti-cancer activity which is believed to arise from the CDK and/or FAK inhibitory activity of the compound.
• the compounds were tested in an in vitro kinase assay in 96 well format using Scintillation Proximity Assay (SPA - obtained from Amersham) for measuring incorporation of [ ⁇ -33-P]-Adenosine Triphosphate into a test substrate (GST-Retinoblastoma).
• SPA Scintillation Proximity Assay
• GST-Retinoblastoma a test substrate
• CDK4/Cyclin D1 partially-purified enzyme (amount dependent on enzyme activity) diluted in 25 ⁇ l incubation buffer was added to each well then 20 ⁇ l of GST-Rb/ATP/ATP33 mixture (containing 0.5 ⁇ g GST-Rb and 0.2 ⁇ M ATP and 0.14 ⁇ Ci [ ⁇ -33-P]-Adenosine Triphosphate), and the resulting mixture shaken gently, then incubated at room temperature for 60 minutes.
• the plates were sealed with Topseal-S plate sealers, left for two hours then spun at 2500rpm, 1124xg., for 5 minutes. The plates were read on a Topcount for 30 seconds per well.
• the incubation buffer used to dilute the enzyme and substrate mixes contained 50mM HEPES pH7.5, 10mM MnCl 2 , 1mM DTT, 100 ⁇ M Sodium vanadate, 100 ⁇ M NaF, 10mM Sodium Glycerophosphate, BSA (1mg/ml final).
• CDK4 As a control, another known inhibitor of CDK4 may be used in place of p16.
• the retinoblastoma 792-928 sequence so obtained was expressed in E.Coli (BL21 (DE3) pLysS cells ) using standard inducible expression techniques, and purified as follows.
• E.coli paste was resuspended in 10ml/g of NETN buffer (50mM Tris pH 7.5, 120mM NaCl, 1mM EDTA, 0.5%v/v NP-40, 1mM PMSF, 1ug/ml leupeptin, 1ug/ml aprotinin and 1ug/ml pepstatin) and sonicated for 2 x 45 seconds per 100ml homogenate. After centrifugation, the supernatant was loaded onto a 10ml glutathione Sepharose column (Pharmacia Biotech, Herts, UK), and washed with NETN buffer.
• NETN buffer 50mM Tris pH 7.5, 120mM NaCl, 1mM EDTA, 0.5%v/v NP-40, 1mM PMSF, 1ug/ml leupeptin, 1ug/ml aprotinin and 1ug/ml pepstatin
• kinase buffer 50mM HEPES pH 7.5, 10mM MgCl2, 1mM DTT, imM PMSF, 1ug/ml leupeptin, 1ug/ml aprotinin and 1ug/ml pepstatin
• the protein was eluted with 50mM reduced glutathione in kinase buffer.
• Fractions containing GST-Rb(792-927) were pooled and dialysed overnight against kinase buffer. The final product was analysed by Sodium Dodeca Sulfate (SDS) PAGE (Polyacrylamide gel) using 8-16% Tris-Glycine gels (Novex, San Diego, USA).
• CDK4 and Cyclin D1 were cloned from RNA from MCF-7 cell line (obtained from ATCC number:HTB22, breast adenocarcinoma line) as follows.
• the RNA was prepared from MCF-7 cells, then reverse transcribed using oligo dT primers.
• PCR was used to amplify the complete coding sequence of each gene [CDK4 amino acids 1-303; Ref. Cell 1992 Oct 16; 71(2): 323-334; Matsushime H., Ewen M.E., Stron D.K., Kato J.Y., Hanks S.K., Roussel M.F., Sherr C.J. and Cyclin D1 amino acids 1-296; Ref. Cold Spring Harb. Symp. Quant. Biol., 1991; 56:93-97; Arnold A., Motokura T., Bloom T., Kronenburg, Ruderman J., Juppner H., Kim H.G. ].
• PCR products were cloned using standard techniques into the insect expression vector pVL1393 (obtained from Invitrogen 1995 catalogue number : V1392-20). The PCR products were then dually expressed [using a standard virus Baculogold co-infection technique] into the insect SF21 cell system (Spodoptera Frugiperda cells derived from ovarian tissue of the Fall Army Worm -Commercially available).
• Example provides details of the production of Cyclin D1/CDK4 in SF21 cells (in TC100 + 10% FBS(TCS) + 0.2% Pluronic) having dual infection MOI 3 for each virus of Cyclin D1 & CDK4.
• SF21 cells grown in a roller bottle culture to 2.33 x 10 6 cells/ml were used to inoculate 10 x 500 ml roller bottles at 0.2 x 10E6 cells/ml.
• the roller bottles were incubated on a roller rig at 28°C.
• viruses were mixed together before addition to the cultures, and the cultures returned to the roller rig 28°C.
• the SF21 cells were then hypotonically lysed by resuspending in lysis buffer (50mM HEPES pH 7.5, 10mM magnesium chloride, 1mM DTT, 10mM glycerophosphate, 0.1mM PMSF, 0.1mM sodium fluoride, 0.1mM sodium orthovanadate, 5ug/ml aprotinin, 5ug/ml leupeptin and 20% w/v sucrose), and adding ice cold deionised water. After centrifugation, the supernatant was loaded onto a Poros HQ/M 1.4/100 anion exchange column (PE Biosystems, Hertford, UK).
• lysis buffer 50mM HEPES pH 7.5, 10mM magnesium chloride, 1mM DTT, 10mM glycerophosphate, 0.1mM PMSF, 0.1mM sodium fluoride, 0.1mM sodium orthovanadate, 5ug/ml aprotinin, 5ug/ml
• CDK4 and Cyclin D1 were coeluted with 375mM NaCl in lysis buffer, and their presence checked by western blot, using suitable anti-CDK4 and anti-Cyclin D1 antibodies (obtained from Santa Cruz Biotechnology, California, US).
• p16 (the natural inhibitor of CDK4/Cyclin D1) was amplified from HeLa cDNA (Hela cells obtained from ATCC CCL2, human epitheloid carcinoma from cervix; Cancer Res. 12: 264, 1952 ), cloned into pTB 375 NBSE which had a 5' His tag, and transformed using standard techniques into BL21 (DE3) pLysS cells (obtained from Promega; Ref. Studier F.W. and Moffat B.A., J. Mol. Biol., 189, 113, 1986 ). A 1 litre culture was grown to the appropriate OD then induced with IPTG to express p 16 overnight.
• the cells were then lysed by sonication in 50mM sodium phosphate, 0.5M sodium chloride, PMSF, 0.5 ⁇ g/ml leupeptin and 0.5 ⁇ g/ml aprotinin.
• the mixture was spun down, the supernatant added to nickel chelate beads and mixed for 1 1 ⁇ 2 hours.
• the beads were washed in sodium phosphate, NaCl pH 6.0 and p 16 product eluted in sodium phosphate, NaCl pH 7.4 with 200mM imidazole.
• the pTB NBSE was constructed from pTB 375 NBPE as follows :-
• the background vector used for generation of pTB 375 was pZEN0042 (see UK patent 2253852 ) and contained the tetA/tetR inducble tetracycline resistance sequence from plasmid RP4 and the cer stability sequence from plasmid pKS492 in a pAT153 derived background.
• pTB375 was generated by the addition of an expression cassette consisting of the T7 gene 10 promoter, multiple cloning site and T7 gene 10 termination sequence.
• a terminator sequence designed to reduce transcriptional readthrough from the background vector was included upstream of the expression cassette.
• the unique EcoRI restriction site present in pTB 375 was removed.
• a new multiple cloning site containing the recognition sequences for the restriction enzymes NdeI, BamHI, PstI and EcoRI was introduced into pTB 375 between the NdeI and BamHI sites destroying the original BamHI site present in pTB 375.
• a new multiple cloning site containing the recognition sequences for the restriction enzymes NdeI, BamHI, SmaI and EcoRI was introduced into pTB 375 NBPE between the NdeI and EcoRI sites.
• the oligonucleotide containing these restriction sites also contained 6 histidine codons located between the NdeI and BamHI sites in the same reading frame as the inititiator codon (ATG) present within the NdeI site.
• CDK2 EMBL Accession No. X62071
• Cyclin A or Cyclin E see EMBL Accession No. M73812
• PCT International Publication No. WO99/21845 the relevant Biochemical & Biological Evaluation sections of which are hereby incorporated by reference.
• CDK2 with Cyclin E partial co-purification may be achieved as follows:-Sf21 cells are resuspended in lysis buffer (50mM Tris pH 8.2, 10mM MgCl 2 , 1mM DTT, 10mM glycerophosphate, 0.1mM sodium orthovanadate, 0.1mM NaF, 1mM PMSF, 1ug/ml leupeptin and 1ug/ml aprotinin) and homogenised for 2 minutes in a 10ml Dounce homgeniser. After centrifugation, the supernatant is loaded onto a Poros HQ/M 1.4/100 anion exchange column (PE Biosystems, Hertford, UK).
• lysis buffer 50mM Tris pH 8.2, 10mM MgCl 2 , 1mM DTT, 10mM glycerophosphate, 0.1mM sodium orthovanadate, 0.1mM NaF, 1mM PMSF, 1ug/ml leupeptin and 1
• CDK2 and Cyclin E are coeluted at the beginning of a 0-1M NaCl gradient (run in lysis buffer minus protease inhibitors) over 20 column volumes. Co-elution is checked by western blot using both anti-CDK2 and anti-Cyclin E antibodies (Santa Cruz Biotechnology, California, US).
• This assay determines the ability of a test compound to inhibit tyrosine kinase activity of human Focal Adhesion Kinase (FAK).
• FAK Focal Adhesion Kinase
• DNA encoding FAK is obtained by total gene synthesis ( Edwards M, International Biotechnology Lab 5(3), 19-25, 1987 ) or by cloning. These are then expressed in a suitable expression system to obtain polypeptide with tyrosine kinase activity.
• FAK obtained by expression of recombinant protein in insect cells, was found to display intrinsic tyrosine kinase activity.
• FAK full length human cDNA described by Andre et al (Biochemical and Biophysical Research Communications, 1993, 190 (1): 140-147 ; EMBL/GenBank Accession Number L05186)
• FAK full length human cDNA described by Andre et al (Biochemical and Biophysical Research Communications, 1993, 190 (1): 140-147 ; EMBL/GenBank Accession Number L05186)
• Active FAK protein has been previously expressed in a baculovirus system using a similar N-terminal 6-histidine tag ( Protein Expression And Purification, 1996, 7: 12-18 ).
• the human FAK cDNA was cloned into the baculovirus transplacement vector, pFastbac 1 (Life Technologies), and the recombinant construct was co-transfected into insect cells (for example Spodoptera frugiperda 21(Sf21)) with viral DNA to prepare recombinant baculovirus (details of the methods for the assembly of recombinant DNA molecules and the preparation and use of recombinant baculovirus can be found in standard texts for example Sambrook et al, 1989, Molecular cloning - A Laboratory Manual, 2nd edition, Cold Spring Harbour Laboratory Press and O'Reilly et al, 1992, Baculovirus Expression Vectors - A Laboratory Manual, W. H. Freeman and Co, New York . Details specific to the use of the pFastbac ('Bac to Bac') system are provided in Anderson et al., 1995, FOCUS (Life Technologies Bulletin Magazine), 17, p53 .)
• Sf21 cells were infected with plaque-pure FAK recombinant virus at a multiplicity of infection of 3 and harvested 48 hours later.
• Harvested cells were washed with ice cold phosphate buffered saline solution (PBS) (10mM sodium phosphate pH7.4, 138mM sodium chloride, 2.7mM potassium chloride) then resuspended in ice cold lysis buffer (50mM HEPES pH7.5, 1mM Dithiothreitol, 100uM Sodium Fluoride, 100uM Sodium Orthovanadate, 10mM Glycerophosphate, 100uM Phenylmethylsulphonylfluoride (PMSF), 5ug/ml Aprotinin, 5ug/ml Leupeptin, 1% Tween; the PMSF being added just before use from a freshly-prepared 100mM solution in methanol) using 250 ⁇ l lysis buffer per 10 million cells.
• PBS phosphate buffered saline
• a stock of substrate solution was prepared from a random copolymer containing tyrosine, for example Poly (Glu, Ala, Tyr) 6:3:1 (Sigma P3899), stored as 1 mg/ml stock in PBS at -20°C and diluted 1 in 500 with PBS for plate coating.
• Poly (Glu, Ala, Tyr) 6:3:1 Sigma P3899
• Test compounds were made up as 10mM or 30mM stocks in DMSO and then further diluted in glass distilled water diluted to a concentration 10 fold higher than the final assay concentration. 10 ⁇ l of diluted compound was transferred to wells in the washed assay plates. "No compound" control wells contained 10 ⁇ l glass distilled water instead of compound.
• ABTS 2,2'-azino-bis(3-ethylbenzthiazoline-6-sulphonic acid)
• Dose response curves were generated from the absorbance readings using Origin Software. Compounds were ranked for potency using the Inhibitory Concentration 50 (IC50), as defined by Origin Software analysis.
• IC50 Inhibitory Concentration 50
• the in vivo activity of the compounds of the present invention may be assessed by standard techniques, for example by measuring inhibition of cell growth and assessing cytotoxicity. For example, further details may be found in the following references:-
• Inhibition of cell growth may be measured by staining cells with Sulforhodamine B (SRB), a fluorescent dye that stains proteins and therefore gives an estimation of amount of protein (i.e. cells) in a well (see Boyd, M. R. (1989) Status of the NCI preclinical antitumour drug discovery screen. Prin. Prac Oncol 10:1-12 ). Thus, the following details are provided of measuring inhibition of cell growth:-
• SRB Sulforhodamine B
• Cells were plated in appropriate medium in a volume of 100 ⁇ l in 96 well plates; media was Dulbecco's Modified Eagle media for MCF-7, SK-UT-1B and SK-UT-1. The cells were allowed to attach overnight, then inhibitor compounds were added at various concentrations in a maximum concentration of 1% DMSO (v/v). A control plate was assayed to give a value for cells before dosing. Cells were incubated at 37°C, (5% CO2) for three days.
• Typical IC 50 values for compounds of the invention when tested in the SRB assay are in the range 1mM to 1nM.
• a pharmaceutical composition which comprises a pyrimidine derivative of the formula (I) , or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof, as defined hereinbefore in association with a pharmaceutically acceptable diluent or carrier.
• composition may be in a form suitable for oral administration, for example as a tablet or capsule, for parenteral injection (including intravenous, subcutaneous, intramuscular, intravascular or infusion) as a sterile solution, suspension or emulsion, for topical administration as an ointment or cream or for rectal administration as a suppository.
• parenteral injection including intravenous, subcutaneous, intramuscular, intravascular or infusion
• sterile solution emulsion
• topical administration as an ointment or cream or for rectal administration as a suppository.
• compositions may be prepared in a conventional manner using conventional excipients.
• the pyrimidine will normally be administered to a warm-blooded animal at a unit dose within the range 5-5000 mg per square meter body area of the animal, i.e. approximately 0.1-100 mg/kg, and this normally provides a therapeutically-effective dose.
• a unit dose form such as a tablet or capsule will usually contain, for example 1-250 mg of active ingredient.
• Preferably a daily dose in the range of 1-50 mg/kg is employed.
• the daily dose will necessarily be varied depending upon the host treated, the particular route of administration, and the severity of the illness being treated. Accordingly the optimum dosage may be determined by the practitioner who is treating any particular patient.
• the pyrimidine derivatives defined in the present invention are effective cell cycle inhibitors (anti-cell proliferation agents), which property (without being bound by theory) is believed to arise from their CDK inhibitory properties.
• the compounds are also effective inhibitors of FAK. Accordingly the compounds of the present invention are expected to be useful in the treatment of diseases or medical conditions mediated alone or in part by CDK and/or FAK enzymes, i.e. the compounds may be used to produce a CDK and/or FAK inhibitory effect in a warm-blooded animal in need of such treatment.
• the compounds of the present invention provide a method for treating the proliferation and/or migration of malignant cells characterised by inhibition of CDK and/or FAK enzymes, i.e. the compounds may be used to produce an anti-proliferative/migration effect mediated alone or in part by the inhibition of CDKs and/or FAK.
• the compounds may also be useful as FAK inhibitors by inducing cell-death (apoptosis).
• a pyrimidine derivative of the invention is expected to possess a wide range of anti-cancer properties as CDKs and/or FAK have been implicated in many common human cancers such as leukaemia and breast, lung, colon, rectal, stomach, prostate, bladder, pancreas and ovarian cancer.
• a pyrimidine derivative of the invention will possess anti-cancer activity against these cancers. It is in addition expected that a pyrimidine derivative of the present invention will possess activity against a range of leukaemias, lymphoid malignancies and solid tumours such as carcinomas and sarcomas in tissues such as the liver, kidney, prostate and pancreas. In particular such compounds of the invention are expected to slow advantageously the growth of primary and recurrent solid tumours of, for example, the colon, breast, prostate, lungs and skin.
• Such compounds of the invention are expected to inhibit the growth of those primary and recurrent solid tumours which are associated with CDK and/or FAK, especially those tumours which are significantly dependent on CDK and/or FAK for their growth and spread, including for example, certain tumours of the colon, breast, prostate, lung, vulva and skin.
• a pyrimidine derivative of the present invention will possess activity against other cell-proliferation/migration diseases in a wide range of other disease states including leukemias, fibroproliferative and differentiative disorders, psoriasis, rheumatoid arthritis, Kaposi's sarcoma, haemangioma, acute and chronic nephropathies, atheroma, atherosclerosis, arterial restenosis, autoimmune diseases, acute and chronic inflammation, bone diseases and ocular diseases with retinal vessel proliferation.
• a pyrimidine derivative of the formula (I), or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof, as defined hereinbefore for use as a medicament and the use of a pyrimidine derivative of the formula (I), or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof, as defined hereinbefore in the manufacture of a medicament for use in the production of an anti-cancer, cell cycle inhibitory (anti-cell-proliferation) effect and/or a FAK inhibitory (anti-cell migration and/or apoptosis inducing) effect in a warm-blooded animal such as man.
• a cell cycle inhibitory effect is produced at the S or G1-S phase by inhibition of CDK2, CDK4 and/or CDK6, especially CDK4 and CDK6.
• the size of the dose required for the therapeutic or prophylactic treatment of a particular cell-proliferation disease will necessarily be varied depending on the host treated, the route of administration and the severity of the illness being treated.
• a unit dose in the range, for example, 1-100 mg/kg, preferably 1-50 mg/kg is envisaged.
• the CDK and/or FAK inhibitory activity defined hereinbefore may be applied as a sole therapy or may involve, in addition to a compound of the invention, one or more other substances and/or treatments.
• Such conjoint treatment may be achieved by way of the simultaneous, sequential or separate administration of the individual components of the treatment.
• the other component(s) of such conjoint treatment in addition to the cell cycle inhibitory treatment defined hereinbefore may be: surgery, radiotherapy or chemotherapy.
• Such chemotherapy may cover three main categories of therapeutic agent:
• the compounds of formula (I) and their pharmaceutically acceptable salts are also useful as pharmacological tools in the development and standardisation of in vitro and in vivo test systems for the evaluation of the effects of inhibitors of cell cycle activity in laboratory animals such as cats, dogs, rabbits, monkeys, rats and mice, as part of the search for new therapeutic agents.
• Triethylamine (33 ml, 0.241 mmol) and methanesulphonyl chloride (19 ml, 0.241 mmol) were added to a solution of 4-anilino-5-bromo-2-[4-(2-hydroxyethoxy)methylanilino] pyrimidine (Example 31; 100 mg, 0.241 mmol) in DCM (5 ml) at 0°C.
• the solution was warmed to ambient temperature and left to stand for 1 hour. Diethylamine (2 ml) was added, and the mixture was heated at 50°C for 3 hours.
• Trifluoroacetic acid (0.25 ml) was added to a solution of 4-anilino-5-bromo-2- ⁇ 4-[3-( t- butoxycarbonylamino)-1-propynyl]anilino ⁇ pyrimidine (Method 25; 30 mg, 0.06 mmol) in DCM (1 ml). The solution was left to stand for 3 hours and volatile material was removed by evaporation. The residue was triturated with diethyl ether to give the product as a trifluoroacetate salt (25 mg, 81 %).
• the starting materials for the Examples above are either commercially available or are readily prepared by standard methods from known materials.
• the following reactions are an illustration, but not a limitation, of some of the starting materials used in the above reactions.
• Triphenylphosphine (7.9 g, 30.0 mmol) was added to a stirred solution of 4-nitrophenol (1.39 g, 10.0 mmol) in DCM (100 ml) and the solution was stirred for 30 minutes.
• a solution of 4-hydroxy-1-methylpiperidine (1.15 g, 11.0 mmol) in DCM (5 ml) was added and the solution was stirred for 2 minutes.
• Diethyl azodicarboxylate (4.9 ml, 30.0 mmol) was added dropwise and the mixture was stirred for 4 hours. Volatile material was removed by evaporation and the residue was dissolved in ethyl acetate (200 ml).
• the solution was washed with water (2 x 100 ml) and then extracted with 2M hydrochloric acid (2 x 50 ml).
• the combined acidic extracts were washed with ether (2 x 100 ml) and then basified by addition of 0.88 ammonia solution.
• the basified solution was extracted with ether (2 x 100 ml) and the extracts were washed with water (2 x 100 ml) and saturated sodium chloride (100 ml) and dried. Volatile material was removed by evaporation and a saturated solution of hydrogen chloride in methanol was added to the residue.
• N -Isopropylethylenediamine (4.87 ml, 39.0 mmol) and potassium carbonate (6.37 g, 46.0 mmol) were added to a solution of 4-fluoronitrobenzene (5.0 g, 35.0 mmol) in DMF (50 ml) and the mixture was heated at 70°C for 3 hours under a nitrogen atmosphere. Insoluble material was removed by filtration and the filtrate was concentrated. The residue was dissolved in ethyl acetate (300 ml) and the solution was washed with water (3 x 100 ml) and saturated sodium chloride (50 ml) and dried.
• the above formulations may be obtained by conventional procedures well known in the pharmaceutical art.
• the tablets (a)-(c) may be enteric coated by conventional means, for example to provide a coating of cellulose acetate phthalate.

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